我想事先向您道歉,因为我对Ruby和Rails不熟悉,所以我无法弄清楚如何在我的项目中使用hashids。该项目是一个简单的图像主机。我已经使用Base58对SQL ID进行编码并在控制器中解码。但是,我希望使URL更加随机,因此切换到了hashids。
我已将hashids.rb文件放置在lib目录中,链接在这里:https://github.com/peterhellberg/hashids.rb 现在有些混淆开始了。我是否需要在每个使用hashids.encode和hashids.decode的页面上初始化hashids?
我发现了这篇文章(http://zogovic.com/post/75234760043/youtube-like-ids-for-your-activerecord-models),它让我相信我可以将其放入初始化程序中,但是在那之后,我仍然得到NameError(未定义本地变量或方法“hashids” ImageManager:Class)。
所以在我的ImageManager.rb类中,我有:
然后在我的image.html.erb视图中,我有这个:
现在如果我添加
在ImageManager.rb、main_controller.rb和我的image.html.erb中,我遇到了以下错误:
我已将hashids.rb文件放置在lib目录中,链接在这里:https://github.com/peterhellberg/hashids.rb 现在有些混淆开始了。我是否需要在每个使用hashids.encode和hashids.decode的页面上初始化hashids?
hashids = Hashids.new("mysalt")
我发现了这篇文章(http://zogovic.com/post/75234760043/youtube-like-ids-for-your-activerecord-models),它让我相信我可以将其放入初始化程序中,但是在那之后,我仍然得到NameError(未定义本地变量或方法“hashids” ImageManager:Class)。
所以在我的ImageManager.rb类中,我有:
require 'hashids'
class ImageManager
class << self
def save_image(imgpath, name)
mime = %x(/usr/bin/exiftool -MIMEType #{imgpath})[34..-1].rstrip
if mime.nil? || !VALID_MIME.include?(mime)
return { status: 'failure', message: "#{name} uses an invalid format." }
end
hash = Digest::MD5.file(imgpath).hexdigest
image = Image.find_by_imghash(hash)
if image.nil?
image = Image.new
image.mimetype = mime
image.imghash = hash
unless image.save!
return { status: 'failure', message: "Failed to save #{name}." }
end
unless File.directory?(Rails.root.join('uploads'))
Dir.mkdir(Rails.root.join('uploads'))
end
#File.open(Rails.root.join('uploads', "#{Base58.encode(image.id)}.png"), 'wb') { |f| f.write(File.open(imgpath, 'rb').read) }
File.open(Rails.root.join('uploads', "#{hashids.encode(image.id)}.png"), 'wb') { |f| f.write(File.open(imgpath, 'rb').read) }
end
link = ImageLink.new
link.image = image
link.save
#return { status: 'success', message: Base58.encode(link.id) }
return { status: 'success', message: hashids.encode(link.id) }
end
private
VALID_MIME = %w(image/png image/jpeg image/gif)
end
end
并且在我的控制器中,我有:
require 'hashids'
class MainController < ApplicationController
MAX_FILE_SIZE = 10 * 1024 * 1024
MAX_CACHE_SIZE = 128 * 1024 * 1024
@links = Hash.new
@files = Hash.new
@tstamps = Hash.new
@sizes = Hash.new
@cache_size = 0
class << self
attr_accessor :links
attr_accessor :files
attr_accessor :tstamps
attr_accessor :sizes
attr_accessor :cache_size
attr_accessor :hashids
end
def index
end
def transparency
end
def image
#@imglist = params[:id].split(',').map{ |id| ImageLink.find(Base58.decode(id)) }
@imglist = params[:id].split(',').map{ |id| ImageLink.find(hashids.decode(id)) }
end
def image_direct
#linkid = Base58.decode(params[:id])
linkid = hashids.decode(params[:id])
file =
if Rails.env.production?
puts "#{Base58.encode(ImageLink.find(linkid).image.id)}.png"
File.open(Rails.root.join('uploads', "#{Base58.encode(ImageLink.find(linkid).image.id)}.png"), 'rb') { |f| f.read }
else
puts "#{hashids.encode(ImageLink.find(linkid).image.id)}.png"
File.open(Rails.root.join('uploads', "#{hashids.encode(ImageLink.find(linkid).image.id)}.png"), 'rb') { |f| f.read }
end
send_data(file, type: ImageLink.find(linkid).image.mimetype, disposition: 'inline')
end
def upload
imgparam = params[:image]
if imgparam.is_a?(String)
name = File.basename(imgparam)
imgpath = save_to_tempfile(imgparam).path
else
name = imgparam.original_filename
imgpath = imgparam.tempfile.path
end
File.chmod(0666, imgpath)
%x(/usr/bin/exiftool -all= -overwrite_original #{imgpath})
logger.debug %x(which exiftool)
render json: ImageManager.save_image(imgpath, name)
end
private
def save_to_tempfile(url)
uri = URI.parse(url)
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == 'https'
http.start do
resp = http.get(uri.path)
file = Tempfile.new('urlupload', Dir.tmpdir, :encoding => 'ascii-8bit')
file.write(resp.body)
file.flush
return file
end
end
end
然后在我的image.html.erb视图中,我有这个:
<%
@imglist.each_with_index { |link, i|
id = hashids.encode(link.id)
ext = link.image.mimetype.split('/')[1]
if ext == 'jpeg'
ext = 'jpg'
end
puts id + '.' + ext
%>
现在如果我添加
hashids = Hashids.new("mysalt")
在ImageManager.rb、main_controller.rb和我的image.html.erb中,我遇到了以下错误:
ActionView::Template::Error (undefined method `id' for #<Array:0x000000062f69c0>)
总的来说,实现hashids.encode/decode并不像实现Base58.encode/decode那么容易,我对如何使其正常工作感到困惑...任何帮助将不胜感激。
image.html.erb
中你缺少了一个闭合的大括号,这是有意为之吗? - fylooi